Tube



FIG. 1 is a bottom front perspective view of a tube, showing my new design;

FIG. 2 is a top front perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a front elevational view thereof, shown in inverted position;

FIG. 5 is a left side view thereof, shown in inverted position; and,

FIG. 6 is a bottom view thereof.

The broken line showing a cap in FIG. 1 is for illustrative purposes only and forms no part of the claimed design. 

I claim, the ornamental design for a tube, as shown and described. 